Package: ledcontrol
Version: 0.5.2-11+b1
Severity: serious

I installed the ledcontrol package.  After this, I was not able to
type various things on my laptop keyboard.  For example, the "u" key
generated the digit "4".

This appears to have been because ledcontrol turned the num lock "led"
on.  As it happens the actual led on my laptop is broken and does not
light up.  But like many keyboard, my laptop behaves differently when
num lock is lit: it generates digits, for example, for a number of
alphabetic keys.

I attempted to fix the problem by purging ledcontrol (which involved
cutting and pasting some letters to type the command!) but this didn't
help.  Changing to VC 1 with "chvt" (the usual vc switch escape keys
were nonfunctional) and then back didn't help.  The normal way for me
to turn on and off num lock from the laptop keyboard - pressing
shift+scroll lock - didn't work, although it usually does work to turn
it on and off.

Luckily in my configuration and circumstances I was able to recover by
plugging in a separate USB keyboard.  It lit its num lock LED when
plugged in.  Pressing num lock on the separate keyboard caused its num
lock LED to go out and fixed the main laptop keyboard.

The bug here is that the ledcontrol package should under no
circumstances change LED states simply by being installed, until it
has been explicitly told to do so.  That's because "LEDs" are often
used by input devices to control keymaps etc., and changing their
state can often be very disruptive.

Ian.



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